I was able to build it, but I had to build together kdevelop and kdevplatform from svn
Anyway I don’t want to release them on my “main” ppa (and anyway it is down for maintenance right now), if you want to try them, you can download them from here
I suggest not to add this ppa to your software sources, because I use to build test package there and it might break some package on your system… Just download the right .deb files for your architecture:

I get the same error, but I get it also uninstalling kdevelop-php and php-docs
Which kde version are you using? That was built upon kde 4.3 and I’m using kde 4.4 RC2 so that might be a problem…
I’ll do some more tests in the next days…